Element.prototype.getAncestorByClassName = function(className){
  var el = this;
  while ((el = el.parentNode)) {
    if(typeof el.className === "string" && el.className.match(className)) {
      return el;
    }
  }
}


Element.prototype.getClass = function(className){
  if(this.nodeName.match(/svg|circle/)) {
    return this.className.baseVal;
  }
  return this.className;
}

Element.prototype.hasClass = function(className){
  return this.getClass().match(className);
}

Element.prototype.addClass = function(className){
  if(this.hasClass(className)) {
    return;
  }
  this.className += " " + className;
}

Element.prototype.removeClass = function(className){
  this.className = this.className.replace(className, '');
}

Element.prototype.replaceClass = function(oldClassName, newClassName){
  this.className = this.className.replace(oldClassName, newClassName);
}

Element.prototype.hide = function(){
  this.style.display = "none";
}

Element.prototype.show = function(displayStyle){
  if(!displayStyle) {
    displayStyle = 'block';
  }
  this.style.display = displayStyle;
}

Element.prototype.replaceOrAddClass = function(oldClassName, newClassName){
  this.replaceClass(oldClassName, newClassName);
  this.addClass(newClassName);
}

if (typeof HTMLDocument !== 'undefined') {
  HTMLDocument.prototype.getElementByClassName = getElementByClassName;
} else {
  Document.prototype.getElementByClassName = getElementByClassName;
}

Element.prototype.getChildByClassName = function(className){
  var children = this.children || this.childNodes;
  for (var i = 0; i < children.length; i++) {
    if (children[i].nodeType == 3) {
      continue;
    }
    var child = children[i];
    if (child.hasClass(className)) {
      return children[i];
    }
    var found = child.getChildByClassName(className);
    if(found) {
      return found;
    }
  }
  return;
}

String.prototype.toUpperCaseWord = function(){
  return this.replace(/\b[a-z]/g, function(letter) {
      return letter.toUpperCase();
  });
}